https://www.bbc.co.uk/news/av/world-middle-east-58653795?at_medium=RSS&at_campaign=KARANGA

Worth watching - it's a beautiful shaft.

That inlet might be interesting if you can get in. A flow like that is draining a very large area in that environment normally. Could go for miles.

Very interesting thanks for sharing 

Not the same one, and Oman not Yemen, but a huge cavern in the desert that breaks the surface with a relatively small window and if you have amazon prime you should be able to watch the film for free (55min running time). More climbing themed than caving, but of subterranean interest for sure!

https://www.amazon.co.uk/Into-Light-Stefan-Glowacz/dp/B07VR6H2WS

Edit: jump to 24mins for warning/example of the dangers of jumaring (a jumar twisting off the rope dropping someone), even for the most experienced people